scom.pdf: This is the pre-peer reviewed version of the following article: Spence, E. A., Chandler-Wilde, S. N., Graham, I. G. and Smyshlyaev, V. P., 2011. A new frequency-uniform coercive boundary integral equation for acoustic scattering. Communications on Pure and Applied Mathematics, 64 (10), pp. 1384-1415 which has been published in final form at http://dx.doi.org/10.1002/cpa.20378